The boilerplate tuple has two slots which can be set:

template	A pair with shape { responder name }, where responder is a responder class, usually a subclass of dispatcher, and name is the name of a template file, without the .xml extension, relative to the directory containing the responder's vocabulary source file.
init	A quotation run before the boilerplate template is rendered. This quotation can set values which the template can then display.